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Date: Fri, 4 Sep 2015 13:29:49 -0700 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Kees Cook <keescook@...omium.org> Cc: Tycho Andersen <tycho.andersen@...onical.com>, Alexei Starovoitov <ast@...nel.org>, Will Drewry <wad@...omium.org>, Oleg Nesterov <oleg@...hat.com>, Andy Lutomirski <luto@...capital.net>, Pavel Emelyanov <xemul@...allels.com>, "Serge E. Hallyn" <serge.hallyn@...ntu.com>, Daniel Borkmann <daniel@...earbox.net>, LKML <linux-kernel@...r.kernel.org>, Network Development <netdev@...r.kernel.org> Subject: Re: [PATCH 4/6] seccomp: add a way to access filters via bpf fds On Fri, Sep 04, 2015 at 01:26:42PM -0700, Kees Cook wrote: > On Fri, Sep 4, 2015 at 9:04 AM, Tycho Andersen > <tycho.andersen@...onical.com> wrote: > > This patch adds a way for a process that is "real root" to access the > > seccomp filters of another process. The process first does a > > PTRACE_SECCOMP_GET_FILTER_FD to get an fd with that process' seccomp filter > > attached, and then iterates on this with PTRACE_SECCOMP_NEXT_FILTER using > > bpf(BPF_PROG_DUMP) to dump the actual program at each step. > > Why is this a new ptrace interface instead of a new seccomp interface? > I would expect this to only be valid for "current", otherwise we could > run into races as the ptracee adds filters. i.e. it is not safe to > examine seccomp filters from tasks other than current. same question. I thought we discussed to add a command to seccomp() syscall for that? -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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